My advise is for you to call your uni/college regarding that issue. Ask any lect you close with (ex:fyp supervisor) to help you to send using postage. It would a benefits for application reference for your cert to any jobs application.
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Is advisable to prove of evidence, seeing is believing therefore please collect your Diploma and update your resume accordingly. To play safe, follow the date issued on your certificate as prove of your completion of your course. Take action immediately.
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